You could always create an Alien alien by swapping eyes though I thought all three were meant to be generic aliens.
The cage as used in the episode saw the super 4 gang captured by the alien tribe who were going to sacrifice them I think. The alien tribe also has problems with dinosaurs - t-rexes - who try to eat them - maybe because they steal baby t-rexes? I watched the whole first season on Netflix - the english version.
The feathers on the headdress for some reason have smaller pins so can't be used with hats that take feathers or vice versa. So feathers that look identical to the double feathers from the indian sets but aren't compatible - I think we've seen that before...
Love the pineapple, you could cut the peg off for a better pineapple for display but at least the peg being there means a klicky can hold the pineapple.
The eyes of the aliens pull out and then you can take the head off if you wanted. The sparky and frosty creatures like the ones in 6831 (fire and ice game) seem to have the same bodies so the heads could be swapped for ... well whatever reason. I guess their heads come off by pulling out their eyes
first too.